New maxi dress

New with tags adjustable shoulder tie maxi sundress. It’s mislabeled. I ordered a medium, label on dress says medium but tag says 1X. The company said I could exchange for correct size but I missed the return window. Tiered skirt, lined, smocked back for an easier fit. Measures 18.5” from armpit to armpit seam, but entire back is very stretchy. From neckline to bottom hem measures 49.5”. Perfect for maternity or postpartum. Loose fitting with smocked chest